Office of Transportation & Air Quality 

EPA-420-B-14-020 

June 2014 

Applicant Guidance for
 

Technical/Engineering Hardship Relief Requests
 

Under 40 CFR 1039.625
 

I. Background 

•	 TPEM provisions (40 CFR 1039.625) allow nonroad equipment manufacturers to exempt part or 

all of their production from Tier 4 standards for a period of up to 7 years 

o	 Use of provisions limited to those entities that have primary responsibility for designing 

and manufacturing equipment and whose manufacturing procedures include installing 

some engines in the equipment 

o	 One exemption or allowance per engine power category is allocated to each 

manufacturer 

 If manufacturer is a subsidiary of a parent company, the allowance is allocated 

to the parent and must be shared across the parent and all subsidiaries 

• Nonroad equipment manufacturers can apply for additional exemptions above and beyond the 

standard TPEM allowance due to technical or engineering hardship (40 CFR 1039.625(m)) 

II. Technical/Engineering Hardship Relief (40 CFR 1039.625(m)) 

•	 Allows EPA to approve additional exemptions if extreme and unusual circumstances that are 

clearly outside of the equipment manufacturer’s control and that could not have been avoided 

with reasonable discretion have resulted in technical or engineering problems that prevent 

them from meeting regulatory requirements 

•	 Request needs to be sent to the Designated Compliance Officer before a violation of TPEM 

requirements occurs: 

Director, Diesel Engine Compliance Center 

U.S. Environmental Protection Agency
 

Office of Transportation and Air Quality
 

U.S. Mail
 

1200 Pennsylvania Ave, NW
 

Mailcode 6405J
 

Washington, DC 20460
 

Courier (UPS, FedEx, etc.)
 

1310 L Street NW, 602A
 

Washington, DC 20005
 

•	 Only available to equipment manufacturers not also producing engines for their equipment 

•	 Must use up standard TPEM allowances under 40 CFR § 1039.625(b)(1) or (2) before using any 

additional allowances 

•	 Additional allowances must be used within the specified seven-year period of 40 CFR §
 

1039.625(a)
 

•	 For manufacturers using the percent-of-production allowance under 40 CFR § 1039.625(b)(1) 
o	 Additional allowances may not exceed 200 percent for each power category (this is on 

top of the 80 percent already allowed under TPEM for a combined maximum of 280 

percent) 

•	 For manufacturers using the small volume allowance under 40 CFR § 1039.625(b)(2) 

o	 Additional allowances may not exceed 2,000 units (this is on top of the small volume 

allowance already allowed under TPEM) 

o	 Alternatively, may waive annual limits specified in 40 CFR § 1039.625(b)(2) instead of or 

in addition to increasing the total number of allowances 

III. Application 

•	 Include all of the information requested per 40 CFR § 1039.625(m)(2)(i) through (ix) 

•	 Include the following additional information for each equipment model that is a subject of the 

request: 

o	 Two Gantt charts illustrating the following: 

 Original plan/schedule for managing redesign of equipment with standard TPEM 

allowance under 40 CFR § 1039.625(b)(1) or (2) 

 Revised plan/schedule clearly identifying unusual events/circumstances outside 

of manufacturer’s control and the resulting delay on redesign of equipment1 

o	 The 12-character EPA engine family name for: 

 The TPEM engine for which you are requesting additional allowances 

 The Tier 4-compliant engine for which you are attempting to redesign your 

equipment 

o	 Market place information, including the following: 

 Major competitors in market segment 

 Your share of market segment 

o	 Production information, including the following: 

 Past 5 years production volumes 

 Projected production volumes for the years in which hardship is anticipated 

o	 Estimate of when you will exhaust your current TPEM allowance 

o	 Documentation on the following: 

 Date(s) you ordered Tier 4-compliant prototype engine 

 Date(s) and volumes of Tier 4-compliant production engines ordered 

o	 Documentation from engine suppliers on the following: 

 Date(s) of delivery or planned delivery of Tier 4-compliant prototype engine 

 Date(s) of delivery or planned delivery of Tier 4-compliant production engines 

1 Please include footnotes on each chart briefly describing the delay. Where applicable, please also include contact 

information for engine supplier or person with direct knowledge of delay and who can corroborate circumstances.